Pseudoscalar in the context of "Scalar field theory"

In physics, angular acceleration (symbol α, alpha) is the time rate of change of angular velocity. Following the two types of angular velocity, spin angular velocity and orbital angular velocity, the respective types of angular acceleration are: spin angular acceleration, involving a rigid body about an axis of rotation intersecting the body's centroid; and orbital angular acceleration, involving a point particle and an external axis.

Angular acceleration has physical dimensions of angle per time squared, with the SI unit radian per second squared (rad⋅s). In two dimensions, angular acceleration is a pseudoscalar whose sign is taken to be positive if the angular speed increases counterclockwise or decreases clockwise, and is taken to be negative if the angular speed increases clockwise or decreases counterclockwise. In three dimensions, angular acceleration is a pseudovector.

Scalar may refer to:

• Scalar (mathematics), an element of a field, which is used to define a vector space, usually the field of real numbers
• Scalar (physics), a physical quantity that can be described by a single element of a number field such as a real number
  • Lorentz scalar, a quantity in the theory of relativity which is invariant under a Lorentz transformation
  • Pseudoscalar, a quantity that behaves like a scalar, except that it changes sign under a parity inversion
• Scalar (computing), any non-composite value
• Scalar boson, in physics, a boson subatomic particle whose spin equals zero